Concerns over potential bird flu pandemic 5 years after first known COVID-19 cases in China

December marks five years since Chinese authorities informed the WHO about a growing number of patients in the country experiencing pneumonia-like symptoms from an unknown sickness. This was the beginning of the COVID-19 pandemic. Now, virologists worry about the spread of H5N1, a respiratory disease commonly known as bird flu. Host Marco Werman speaks with Andrew Pekosz, a virologist at Johns Hopkins Bloomberg School of Public Health.